Water supplying apparatus for concrete mixers



July 24, 1934. J. EGGERT 1,967,991

WATER SUPPLYING APPARATUS FOR CONCRETE MIXERS Filed Nov. 951

ZSnoentor JOSEPH EGGERT (Ittomeg 5 "provided to prevent it the fluidconcrete works Patented July 24, 1934 l- V f 7 957,991

PATENT" OFFICE;

WATEIR'ISUPPLYING, APPARATUS For;

CONCRETE MIXERSL. Joseph Eggert, Columbus, Ohio, assignor to Thecorporation of Ohio Jaeger Machine Company, Columbus, Ohio, a

Application November 4, 1931, Serial No. 573,005

2 Claims.

This invention relates generally to concrete mixing apparatus andparticularly to such as have a mixing drum mounted on a motor vehiclewhereby the concrete may be mixed or transported or mixed duringtransportation. Such concrete apparatus is now usually equipped withmeans for supplying water to the dry ingredients of concrete, includinga water supply tank from which a pipe leads into the drum.

t has been found that unless some means are back into the water supplypipe and settles and hardens on the interior of the pipe eventuallyclosing and rendering the same unsuitable for properly conducting waterinto the drum.

The object of the present invention is more particularly to provideimproved means whereby the concrete is prevented in large measure fromworking back into the water supply pipe and whereby such fine particlesof cement suspended in the water as do work back are largely trapped andthe trapping means made removable so that it can be removed from time totime and cleared of the deposit.

- a An example of the invention is shown in the accompanying drawing inwhich- Figure 1 illustrates in vertical sectional view a truck mixerdrum containing the invention.

Fig. 2 illustrates in section on a larger scale a valve device having atrapping means according to the invention.

looking to the left.

Fig. 3 is an elevation looking at the right hand side of Fig. 2 with theflexible valve gasket removed. Fig. 4 is a section on the line IVIV Fig.2

Fig. 5 is a detail section on the line V-V Fig. 3 looking to the right.

In the views 5 designates the mixing drum of the variety having mixingblades or screws,'a cen- "m1 cylindrical portion with a tapered forwardend closed, except for a water pipe and a taperedrear or discharge endprovided with a removable cover. The mixing drum is rotatably supportedon a truck and has a suitable annular gear rack 5 whereby it may berotated by power, as usual.

6 designates a water tank from which extends a pipe 7 for supplyingwater to the interior of the drum for mixing with the dry materials ofthe 1 concrete.

Threaded to the pipe '7 is a flared and flanged between rigid metalliccircular plates of smaller diameter than the flexible member so that theprotruding rim or margin of said member shall bear with yieldingpressure against the inner conical surface of the casting 8.

Beyond the casting 8 is another casting having a flared portion 13 and athreaded central boss 14 and a cylindrical portion having an annularflange 15. The flared portion 13 has a circular opening broken by fourribs or spokes 13 having threaded holes to receive bolts 16. Placedaround said circular opening is a ring of resilient flexible material 17braced between stiff metallic rings and secured to said four threadedholes by bolts 16 so that the interior and exterior projecting marginsshall bear with a yielding pressure against the central boss and theflared interior surface of the casting respectively. The ribs 13 havebeveled sides as shown in Figs. 3 and 5 to promote the shedding of theconcrete material back into the mixing vessel.

Secure between the flanges of the two castings referred to by means offour bolts 18 is a trap ring 21 forming a closed and annularlyprojecting chamber 22 between the two valves.

In practice when water is to be supplied to the mixing drum a suitablevalve at 23 or other control is opened and the pressure of the waterfrom the tank opens said valves and permits the flow of water into thedrum and when the water is shut off the elastic flexible margins closeagainst the respective walls.

When the mixing operation takes place the flexible valves prevent, to alarge extent, the entrance of the wet concrete but such water con- 00taining the fine particles of cement as may work back in the pipe aroundthe elastic margins of the valve gaskets deposits a large part of thesolid contents into the trap. From time to time the trap may be takenout by removing the bolts 18 and the collected silt removed from theinterior thereof.

A second supplemental valve 24 similar in construction to that of theforward valve member first described can be added on the end of a pipeextension 25 secured into the boss 14 or center of the second valve forthe purpose of supplying water to the drum quickly and more evendiffusion through the dry materials.

The forms of the parts can be changed without v departing from the gistof the invention as claimed.

What I claim is:

1. A check valve structure including two perforated heads, one of whichis provided withllO lateral discharge outlet, means external to saidpipe at the discharge outlet thereof for preventing the contents of saiddrum from working back into said pipe through said outlet, said meansincluding a shield of rigid and flexible material surrounding said pipeat said outlet and protecting said outlet, said flexible portionpermitting discharge only of water from said pipe and a hood of rigidmaterial on the pipe protecting said flexible portion of the shield fromdestructive action of the batch being mixed.

JOSEPH EGGERT.

